diff --git a/hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt b/hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
index 90f6732da3a..7b6d1651953 100755
--- a/hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
+++ b/hadoop-hdfs-project/hadoop-hdfs/CHANGES-HDFS-EC-7285.txt
@@ -341,3 +341,6 @@
 
     HDFS-8484. Erasure coding: Two contiguous blocks occupy IDs belong to same
     striped group. (Walter Su via jing9)
+
+    HDFS-8744. Erasure Coding: the number of chunks in packet is not updated
+    when writing parity data. (Li Bo)
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java
index 9e201ad5d92..f41044b299e 100755
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSOutputStream.java
@@ -419,7 +419,7 @@ public class DFSOutputStream extends FSOutputSummer
 
     currentPacket.writeChecksum(checksum, ckoff, cklen);
     currentPacket.writeData(b, offset, len);
-    currentPacket.incNumChunks();
+    currentPacket.incNumChunks(1);
     streamer.incBytesCurBlock(len);
 
     // If packet is full, enqueue it for transmission
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSPacket.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSPacket.java
index a26e35e7c58..2698de39c26 100755
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSPacket.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSPacket.java
@@ -259,10 +259,10 @@ public class DFSPacket {
   }
 
   /**
-   * increase the number of chunks by one
+   * increase the number of chunks by n
    */
-  synchronized void incNumChunks() {
-    numChunks++;
+  synchronized void incNumChunks(int n) {
+    numChunks += n;
   }
 
   /**
diff --git a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSStripedOutputStream.java b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSStripedOutputStream.java
index 4234351d369..e6de714abaf 100644
--- a/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSStripedOutputStream.java
+++ b/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/DFSStripedOutputStream.java
@@ -389,11 +389,13 @@ public class DFSStripedOutputStream extends DFSOutputStream {
       int maxBytesToPacket = p.getMaxChunks() * bytesPerChecksum;
       int toWrite = byteBuffer.remaining() > maxBytesToPacket ?
           maxBytesToPacket: byteBuffer.remaining();
-      int ckLen = ((toWrite - 1) / bytesPerChecksum + 1) * getChecksumSize();
+      int chunks = (toWrite - 1) / bytesPerChecksum + 1;
+      int ckLen = chunks * getChecksumSize();
       p.writeChecksum(checksumBuf, ckOff, ckLen);
       ckOff += ckLen;
       p.writeData(byteBuffer, toWrite);
       getCurrentStreamer().incBytesCurBlock(toWrite);
+      p.incNumChunks(chunks);
       packets.add(p);
     }
     return packets;